CVE-2026-11279: Critical Out-of-Bounds Read in Chrome DevTools – Patch Immediately

Technical summary

CVE-2026-11279 is an out-of-bounds read vulnerability (CWE-125) located in the DevTools subsystem of Google Chrome. The flaw permits a remote, unauthenticated attacker to trigger arbitrary code execution within Chrome's sandboxed process by supplying a malicious HTML page. The vulnerability requires user interaction—the victim must visit the attacker's crafted page—but no prior authentication or elevated permissions are necessary. The attack succeeds across the network without requiring special system configuration. The sandboxed execution context limits the immediate blast radius, but a successful exploit could allow attackers to break out of the sandbox and gain deeper system access depending on additional chaining conditions.

Business impact

Organizations where employees browse the web using Chrome face potential compromise of user sessions, credentials, and local data accessible to the browser process. In enterprise environments, this could facilitate lateral movement or data exfiltration if combined with other vulnerabilities or misconfigured security controls. The requirement for user interaction lowers the automated attack surface, but phishing, malicious advertisements, or compromised legitimate websites could deliver the exploit payload at scale. Delayed patching extends the window during which end-users remain at risk.

Affected systems

Google Chrome on Windows, macOS, and Linux systems running versions prior to 149.0.7827.53 are directly affected. The vulnerability is specific to the Chrome browser; however, Chromium-based browsers (Edge, Brave, Opera, etc.) built from vulnerable Chromium versions may also be impacted—organizations should verify their specific browser versions against Chromium release notes. The vulnerability does not affect Chrome OS, which uses a different sandbox model.

Exploitability

Exploitability is moderate to high. An attacker must craft a malicious HTML page and trick or lure a user into visiting it. This typically occurs via phishing emails, compromised websites, or malicious advertisements. No special exploit kit or advanced capabilities are required once the user visits the page. The out-of-bounds read is triggered automatically upon page load, making weaponization straightforward. The vulnerability has not been added to the CISA Known Exploited Vulnerabilities (KEV) catalog, suggesting either that exploitation in the wild has not been confirmed or is not yet widespread as of the publication date.

Remediation

Immediate patching to Chrome version 149.0.7827.53 or later is the primary remediation. Chrome's automatic update mechanism should deploy the patch within 24–48 hours of release for most users, but enterprise deployments may have staged rollout schedules. Organizations using managed Chrome deployments should verify patch status via their mobile device management (MDM) or enterprise policy tools. No workarounds exist beyond keeping the browser updated or restricting access to untrusted web content.

Patch guidance

Verify that all Chrome installations have been updated to version 149.0.7827.53 or later. For enterprise deployments, check the Chrome management console for patch compliance across organizational devices. If your organization uses Chromium-based alternatives (Edge, Brave, etc.), cross-reference those projects' release schedules to confirm they have integrated the upstream fix. Set automatic updates to enabled if not already configured. For air-gapped or offline environments, obtain the patched installer from Google's official distribution channels and test in a staging environment before wide deployment.

Detection guidance

Monitor network logs for suspicious HTML traffic, unusual JavaScript execution patterns, or abnormal process spawning from the Chrome process. Endpoint detection and response (EDR) tools should flag attempts to break out of the Chrome sandbox or establish unexpected outbound connections from browser processes. Web gateway logs may show access to known malicious or newly registered domains hosting exploit payloads. Within Chrome DevTools logs (if available and verbose logging is enabled), look for unexpected out-of-bounds memory access patterns or crashes in DevTools components. However, detection at the point of exploitation is difficult; prevention through patching and user awareness remains the primary control.

Why prioritize this

Prioritize this vulnerability for immediate patching despite the KEV list not including it yet. The CVSS score of 8.8 (HIGH) combined with network accessibility, low attack complexity, and the requirement only for user interaction places it in the upper tier of browser vulnerabilities. The presence of code execution capabilities—even within a sandbox—poses a material risk, particularly in organizations where users frequently visit external websites. Rapid patch deployment minimizes the window during which attackers can reliably exploit this flaw.

Risk score, explained

The CVSS 3.1 score of 8.8 (HIGH severity) reflects: Network accessibility (AV:N) means remote exploitation without proximity; Low attack complexity (AC:L) indicates no special conditions beyond crafting the HTML payload; No privileges required (PR:N) and user interaction (UI:R) balance the score—an attacker cannot exploit passively but does not need elevated starting permissions; Confidentiality, Integrity, and Availability impacts are all High (C:H/I:H/A:H) within the scope of the browser process and potentially the system if sandbox escape is chained with other flaws. The score justifies rapid remediation despite Chromium's internal Low severity rating.

Frequently asked questions